Citicorp Center Engineering Crisis

picture info	Citicorp Center Engineering Crisis The Citicorp Center engineering crisis was the discovery, in 1978, of a significant structural flaw in Citicorp Center, then a recently completed skyscraper in New York City, and the subsequent effort to quietly make repairs over the next few months. The building, now known as Citigroup Center, occupied an entire block and was to be the headquarters of Citibank. Its structure, designed by William LeMessurier, had several unusual design features, including a raised base supported by four offset stilts, and diagonal bracing which absorbed wind loads from upper stories. In the original design, potential wind loads for the building were calculated incorrectly. The flaw was discovered by Diane Hartley, an undergraduate student at Princeton University who was writing a thesis on the building which was communicated to the firm responsible for the structural design. However, LeMessurier asserted that he spoke with a young male student of architecture whose questioning prompted him to r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	LeMessurier Associates William "Bill" James LeMessurier, Jr. (; June 12, 1926 – June 14, 2007) was a prominent American structural engineer. Early life and education Born in Pontiac, Michigan, Bill was the youngest of four children of Bertha (Sherman) and William James LeMessurier Sr., owners of a dry cleaning business. After finishing high school, he left Michigan to major in Mathematics at Harvard College. He graduated with an AB in Mathematics in 1947, then went to Harvard Graduate School of Design. He later transferred to the Massachusetts Institute of Technology where he earned his Master's Degree in building engineering and construction in 1953. Career While at MIT, LeMessurier worked for Albert Goldberg, an established Boston structural engineer; eventually LeMessurier became a partner and the firm was renamed Goldberg-LeMessurier Associates. In April 1961, the two separated and Bill launched his firm LeMessurier Consultants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	William LeMessurier William "Bill" James LeMessurier, Jr. (; June 12, 1926 – June 14, 2007) was a prominent American structural engineer. Early life and education Born in Pontiac, Michigan, Bill was the youngest of four children of Bertha (Sherman) and William James LeMessurier Sr., owners of a dry cleaning business. After finishing high school, he left Michigan to major in Mathematics at Harvard College. He graduated with an AB in Mathematics in 1947, then went to Harvard Graduate School of Design. He later transferred to the Massachusetts Institute of Technology where he earned his Master's Degree in building engineering and construction in 1953. Career While at MIT, LeMessurier worked for Albert Goldberg, an established Boston structural engineer; eventually LeMessurier became a partner and the firm was renamed Goldberg-LeMessurier Associates. In April 1961, the two separated and Bill launched his firm LeMessurier Consultants. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Citigroup Center (1977) (A The Citigroup Center (formerly Citicorp Center and also known by its address, 601 Lexington Avenue) is an office skyscraper in the Midtown Manhattan neighborhood of New York City. Built in 1977 for Citibank, it is tall and has of office space across 59 floors. The building was designed by architect Hugh Stubbins, associate architect Emery Roth & Sons, and structural engineer William LeMessurier. The Citigroup Center takes up much of a city block bounded clockwise from the west by Lexington Avenue, 54th Street, Third Avenue, and 53rd Street. Land acquisition took place from 1968 to 1973; St. Peter's Church sold its plot on the condition that a new church building be constructed at the base of the tower. The design was announced in July 1973, and the structure was completed in October 1977. Less than a year after completion, the structure had to be strengthened when it was discovered that, due to a design flaw, the building was vulnerable to collapse in high winds. The build ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]